追求美好！我用python~~~~

我会带着你远行 2022-09-03 12:14 187阅读 0赞

#不建议继承List和dict
    class Mydict(dict):
        def __setitem__(self, key, value):
            super().__setitem__(key,value*2)
    my_dict=Mydict(one=1)
    print(my_dict)
    my_dict['two']=1
    print(my_dict)
    '''
    结果：
    {'one': 1}
    {'one': 1, 'two': 2}
    '''
    from collections import UserDict
    class Mydict2(UserDict):
        def __setitem__(self, key, value):
            super().__setitem__(key,value*2)
    my_dict2=Mydict2(one=1)
    print(my_dict2)#{'one': 2}

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70][]

class User(object):
        def __init__(self,username,password):
            self._username=username
            self._password=password
    
        @property
        def username(self):
            return self._username
        @username.setter
        def username(self,username):
            self._username=username
    
        @property
        def password(self):
            return self._password
        @password.setter
        def password(self,password):
            self._password=password
    
        def __enter__(self):
            print('before:auto do somethin before statements body of witg executed')
            return self
        def __exit__(self, exc_type, exc_val, exc_tb):
            print('after:auto do something after statements bdy of with executed')
    
    if __name__ == '__main__':
        
        boy=User('faker','faker2021')
        print(boy.password)
        print("上下文管理器with语句：")
        with User('faker','faker2021') as user:
            print(user.password)
        print('------end----------')
        '''
        faker2021
        上下文管理器with语句：
        before:auto do somethin before statements body of witg executed
        faker2021
        after:auto do something after statements bdy of with executed
        ------end----------
        
        Process finished with exit code 0
    
        '''

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODg1ODg2MA_size_16_color_FFFFFF_t_70]: /images/20220829/f826993314444bde80a40a5543a393dd.png